COMMENT: Sat-nav meaning satellite navigation. That’s right: you know you want a pair. More than one.
LET’S EXPLAIN THIS: The idea here is that we have an insurable risk. Rather than just buying a policy from whoever-is-advertising-during-a-sports-event, we set up our own (small) insurance company. Granted, we are never going to rival the big boys, but it is enough for our needs. If we can leap through selected hoops, we might also get a tax break from the arrangement.